G - Physics – 10 – L
Patent
G - Physics
10
L
354/54
G10L 19/06 (2006.01) G10L 19/00 (2006.01)
Patent
CA 1333940
Apparatus and method for determining formant information of a speech signal in a transform coder is disclosed which coder operates on a sampled time domain information signal comrosed of information samples which are sequentially segregated into groups of information sample blocks and which blocks are transformed from the time domain to a transform domain wherein a block of samples is now represented by a block of transform coefficients, which apparatus and method includes generating an even extension of each block of time domain samples, generating an auto- correlation function from such extension, deriving linear prediction coefficients derived from the auto-correlation function and performing a Fast Fourier Transform on such linear prediction coefficients such that the variance or formant information of each transform coefficient is equal to the square of the gain of each FFT coefficient. In a further aspect of the invention, apparatus and method are provided for determining the number of bits to be assigned to each transform coefficient by determining the logarithm of a predetermined base of the formant information of the transform coefficients then determining the minimum number of bits which will be assigned to each transform coefficient and then determining the number of bits to be assigned to each of the transform coefficients by adding the minimum number of bits to the logarithmic number. In still a further aspect of the invention, an apparatus and methods are provided for assuring that the bit allocation or bit assignment made for each coefficient is an integer value.
600458
Nuera Communications
Shapiro Cohen
LandOfFree
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